Sigmund Freud, Alfred Adler, and Carl Jung were associates for a period of time in Vienna as each developed his own approach to psychotherapy. In the following collection of articles, Vision examines how these three approaches have withstood the test of time.

Among Roman Catholic thinkers, Thomas Aquinas stands out for his integration of Greek philosophy with the dogmas of the church—an approach that has had a profound and lasting effect on the Christian world.